That ebay About Me page is really underused by sellers, and it's the most important page for those wanting to direct ebay traffic to their own site.
You can't directly link your off-ebay store to that page, but that's where social networking sites play the role of the link. You can use use them, as dts has done, and direct traffic to your facebook, or where ever, and from there you have the ability to market your own website to them.
Big trick here is getting people to your About Me page, and that's actually extremely simple. Limit the amount of information you provide in your actual listing itself, keep it to the description only.
Generic information, such as payment options, shipping costs, despatch times, and all other information then gets listed on the About Me page (where you have your social network links set-up.
Setting it up like this generates traffic flow to that page, as in the listing you send them there for further information. I have a link in my listing template simply called 'Answer Centre'
The moment anyone wants any information outside of the item description, they have to hit that link and I have them on my About Me page.
From there you can decide to just post your social networking links, sit and wait, or market them by offering an inducement for those who ad you to their page.
Btw, when people email for information you have contained on that page, send them the page link, don't waste an opportunity to market the page to a customer by answering the question in the reply.
If you want to get ebay traffic off ebay, utilize that page to its full potential, or as I like to say, exploit that little loop hole ebay has left open, because they don't miss much lol